Brother DCP-8020 - Manual (Page 41)

PAPER 2 - 9
To load paper or other media in the multi-purpose tray
(MP tray) (For DCP-8025D)
1
Open the MP tray and lower it gently.
2
Pull out and unfold the MP tray support flap.
3
When loading paper in the MP tray, make sure it touches the
back of the tray.
When printing envelopes and labels you should only use the
multi-purpose tray.
Make sure that the paper is straight and in the proper position
on the MP tray. If it is not, the paper may not be fed properly,
resulting in a skewed printout or a paper jam.
MP tray support flap